TM-9-2350-311-20-1

HOWITZER, MEDIUM, SELF-PROPELLED, 155MM; M109A2, M109A3, M109A4 AND M109A5

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL FOR HULL, POWERPLANT, DRIVE CONTROLS, TRACKS, SUSPENSION, AND ASSOCIATED COMPONENTS

AUGUST 1994

TM-9-2350-311-20-1 - Page 363 of 1275

TM 9-2350-311-20-1

CAUTIO N

B.O. drive light must be kept free of foreign material

such as dirt, oil, grease, and fingerprints. Failure to do

so will cause damage to halogen bulb.

(3) B.O. DRIVE LIGHT FAILS TO OPERATE; ALL

OTHER LIGHTS OPERATE

T

OO

I

S

General mechanic’s tool kit (item 64, Appx H)

Multimeters (item 36, Appx H)

TA-1 probe kit (item 43, Appx H)

Driver’s instrument panel released (para 8-1 7)

A

1. Disconnect bulkhead-to-driver’s instrument

panel wiring harness from main light switch.

2. Place a jumper wire from socket F (lead

15) to socket D (lead 19/520).

3. Turn MASTER switch ON, place main light

switch to B.O. DRIVE position, and check

B.O. drive light for operation.

4. Turn MASTER and main light switches OFF.

Does B.O. drive light operate?

Replace

light switch (para 8-17).

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